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100 lines (78 loc) · 2.54 KB
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// Create a callback function and invoke the function to test your work. You have been provided an example of a problem and a solution to see how this works with our items array. Study both the problem and the solution to figure out the rest of the problems.
const items = ['Pencil', 'Notebook', 'yo-yo', 'Gum'];
/*
//Given this problem:
function firstItem(arr, cb) {
// firstItem passes the first item of the given array to the callback function.
}
// Potential Solution:
function firstItem(arr, cb) {
return cb(arr[0]);
}
firstItem(items, function(first) {
console.log(first)
});
*/
function logLength(length) {
console.log(length);
}
function getLength(arr, cb) {
// getLength passes the length of the array into the callback.
return cb(arr.length)
}
getLength(items, logLength);
/////////////////////////////////////////
function logLast(lastItem) {
console.log(lastItem)
}
function last(arr, cb) {
// last passes the last item of the array into the callback.
let lastI = arr.length -1;
return cb(arr[lastI]);
}
last(items, logLast);
////////////////////////////////////////
function logSum(sum) {
console.log(sum);
}
function sumNums(x, y, cb) {
// sumNums adds two numbers (x, y) and passes the result to the callback.
let sum = x + y;
return cb(sum);
}
sumNums(5, 5, logSum);
////////////////////////////////////////
function multiplyNums(x, y, cb) {
// multiplyNums multiplies two numbers and passes the result to the callback.
product = x * y;
return cb(product);
}
multiplyNums(7, 6, function() {
console.log(product);
});
////////////////////////////////////////
function contains(item, list, cb) {
// contains checks if an item is present inside of the given array/list.
// Pass true to the callback if it is, otherwise pass false.
list.forEach((x, i) => x === item ? cb(i, true) : cb(i, false));
}
contains("Gum", items, function(index, input) {
if (input) {
console.log(`Item has been found at index ${index}.`)
} else {
console.log(`Item not found at index ${index} :(`)
}
})
/* STRETCH PROBLEM */
const logDeDuped = (array) => console.log(array);
function removeDuplicates(array, cb) {
let mirrored = [...array];
let deDupe = mirrored.filter((x, i, thisArr) => {
return thisArr.indexOf(x) == i;
})
cb(deDupe);
// removeDuplicates removes all duplicate values from the given array.
// Pass the duplicate free array to the callback function.
// Do not mutate the original array.
}
removeDuplicates(["test", "test", "duplicateTest", "test"], logDeDuped);